A want lias long been felt in this country of a good elementary treatise on Theoretical Mechanics. The books on that subject, in the English language, are mostly voluminous, and either adapted to the comprehension of those only who have mastered the various branches of analytical mathematics, or composed chiefly of practical and descriptive details. Hence, an accurate knowledge of the general laws, or grand fundamental truths of mechanics, so important to all men, in this eminently practical age and country, and especially to those who have some one of the useful arts as their daily occupation, has hitherto been attainable only by highly educated men.